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PRINCIPAL ACCOUNTING POLICIES - Acquisitions (Details) € in Millions, ¥ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 CNY (¥) | Apr. 30, 2020 EUR (€) | Apr. 30, 2020 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Others |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |
Purchase consideration |  |  |  | ¥ 8.0 | ¥ 1.8 | ¥ 0.0
Purchase price allocation |  |  |  |  |  |
Identifiable intangible assets |  |  |  | ¥ 10.0 | ¥ 0.5 | ¥ 0.0
Online travel agency |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |
Purchase consideration |  | € 100 | ¥ 772.0 |  |  |
Previously held interest (as a percent) |  |  | 100.00% |  |  |
Purchase price allocation |  |  |  |  |  |
Fair value of the supplier relationship |  |  | ¥ 28.0 |  |  |
Identifiable intangible assets |  |  | 72.0 |  |  |
Deferred tax liabilities |  |  | 16.0 |  |  |
Goodwill |  |  | 1,000.0 |  |  |
Cash and cash equivalents |  |  | 41.0 |  |  |
Net assets acquired/(net liability assumed) |  |  | ¥ (304.0) |  |  |
Amortization period |  | 10 years | 10 years |  |  |
Online payment agency |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |
Purchase consideration | ¥ 423.0 |  |  |  |  |
Previously held interest (as a percent) | 100.00% |  |  |  |  |
Purchase price allocation |  |  |  |  |  |
Identifiable intangible assets | ¥ 324.0 |  |  |  |  |
Deferred tax liabilities | 81.0 |  |  |  |  |
Goodwill | 119.0 |  |  |  |  |
Cash and cash equivalents | 113.0 |  |  |  |  |
Net assets acquired/(net liability assumed) | ¥ 61.0 |  |  |  |  |

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